“Sorceress Of Grayskull” by Mark Alvarado Posted on February 8, 2019 by admin Reply Mad Duck now has “Sorceress Of Grayskull” by Mark Alvarado now available as part of their licensed Masters Of The Universe posters. On sale now HERE. “Sorceress Of Grayskull” by Mark Alvarado. 18″ x 24″ Giclee. Ed of 250. $55 “Sorceress Of Grayskull” by Mark Alvarado. 18″ x 24″ Giclee. Ed of 150. $65 (variant)